WHY ARE RIVER VALLEYS THICKLY POPULATED
Nowadays, people take to smart methods and migrate or travel to places of agricultural and water prosperity. These conditions can be satisfied by going to river valleys and settling down there. They go here, as droughts don't occur regularly and the people will have plenty of good to eat. Smart choices are not uncommon in today's world as people study hard enough to settle down in river valleys and build their shelters over there.